YOKOGAWA VZ20X, User Manual

Page: 117 / 158

8-2
IM 77V01B01-01EN 5th Edition: 2023.03.07-00
8.1 Input Calibration
Calibration once every year is recommended to maintain measurement accuracy.
By calibration, corresponding inputs are applied to each of the 0, 50, 100% points on the
measurement input range, and the error is calculated based on the difference with the
actual measured value. If the error is not within accuracy specifications, inputs must be
adjusted. See "8.2 Input Adjustment."
■
Required equipment
The following calibration equipment is required for calibration.
●
Recommended equipment
・
DC voltage generator: ADC 6166 or equivalent
・
Resistor: Alpha Electronics ADR-3204GRV or ADR-6103M or equivalent
・
0°C reference temperature unit: ZC-114/ZA-10 made by Coper Electronics Co., Ltd.
or equivalent
1
Wire the VZ20X to the calibration equipment as shown in the figure on the next
page, and sufficiently warm up each of the equipment. (Warm up the VZ20X for at
least 40 minutes.)
For precautions in wiring, see "Chapter 4 Wiring."
2
Check that the ambient temperature, humidity and other operating environment
conditions are within specification (23±2°C, 55±10% RH).
3
Corresponding inputs are applied to each of the 0, 50, 100% points on the
measurement input range, and the error is calculated based on the difference with
the actual measured value and the reference value. Each channel on the VZ20X
must be calibrated. If the error is not within accuracy specifications, inputs must
be adjusted to within specification according to the description in “8.2 Input
Adjustment.”
Note
With thermocouple input, the temperature of the input terminal must be measured and a
voltage must be added that takes into consideration the reference junction
compensation temperature.